In 1978, Jim Johnston had a vision to develop a startup engineering firm, James Johnston & Associates Inc., which focused on providing an enhanced quality of engineering design services for the building construction industry.


Jim Johnston provided a hands-on management approach for projects and clients while taking time from each day to mentor and develop staff. This "teacher" mentality developed many excellent engineers in the mechanical and electrical disciplines of the building construction industry, many who are still employed with us.


With the inclusion of senior level personnel on each project, the business established a core group of select clients providing repeat design opportunities throughout the Dallas-Fort Worth Metroplex. Continued growth has helped us expand our services, offering clients MEP engineering specialization across a multitude of market sectors. Today, we do business simply as JJA, Inc., serving local, regional, and national clients.


We are proud of Jim's vision and dedicated effort building JJA and its quality reputation. Jim continues to counsel the firm as an advisor and sounding board for the engineering staff, assuring his vision continues.

Jim Johnston, P.E.

Founder, CEO in Counsel

JJA, Inc.  Mechanical Engineering   |  Electrical Engineering   |  Plumbing & Fire Suppression   |  Certified Commissioning Agents

8150 North Central Expressway   |   M-2100 Campbell Centre   |   Dallas, Texas 75206   |   Phone: 214-739-8880   |    Fax: 214-622-6409

Texas Registered Engineering Firm #F-1290.  Copyright © JJA, Inc. 2023. All rights reserved.